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If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio of their resistances will be
Options
(a) (3:2)
(b) (2:3)
(c) (3:4)
(d) (4:3)
Correct Answer:
(3:2)
Explanation:
P = V² / R
⇒ R₁ / R₂ = P₂ / P₁ = 60 / 40 = 3 / 2 = 3 : 2
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In intrinsic semiconductor at room temperature number of electrons and holes are
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- A force F=ai+3j+6k is acting at a point r=2i-6j-12k. The value of α for
- In India, electricity is supplied for domestic use at 200V. It is supplied at 110 V
- The angular speed of earth, so that the object on equator may appear weightless
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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